Evaporating-pan



(No Model.) y

H. F. THURSTON.

EVAPORATING PAN.

No. 476,701. Patented June 7,1892.

M WW II ATTORNEYJ" WITNESSES:

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HARRISON F. THURSTON, OF CENTRE BARTLETT, NEXV HAMPSHIRE.

EVAPQRATING-PAN.

SPECIFICATION forming part of Letters Patent No. 476,701, dated June 7, 1892.

Application filed June 25, 1891.

To all whom it may concern.-

Be it known that I, HARRISON F. THURS- TON, of Centre Bartlett, in the county of Carroll and State of New Hampshire, have invented a new and 1m proved EvaporatingPan, of which the following is a full, clear, and exact description.

My invention relates to improvements in evaporators such as are used for making maple sirup and sugar; and the object of myinvention is to produce a simple form of evaporator by means of which sap maybe rapidly reduced to sirup, which is provided, also, with means for boiling the sirup to sugar, and which is arranged so that it has an extremely large heating-surface, and will consequently work rapidly with comparatively little fuel.

this end my invention consists in certain features of construction and combinations of parts, which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar numerals of reference indicate corresponding parts in all the views.

Figure 1 is a broken vertical longitudinal section of the evaporator on the line 2 in Fig. 2. Fig. 2 is an inverted sectional plan on the line cc :0 of Fig. 1, and Fig. 3 is a broken vertical cross-section on the line yy of Fig. 2.

The evaporator is provided with a panlike receptacle 11, into which the sap to be evaporated is poured, and this receptacle is provided on the bottom with a series of hollow flanges 12 and 12, the flanges 12 being arranged around the outer edge of the receptacle and the flanges 12 being produced near the center of the same. The flanges 12 thus form supports for the receptacle, and the flanges 12 are also deep enough to extend to the ash-pan, on which the receptacle rests, and they thus form a series of fines, the fines occurring between the flanges.

The fire-box 13 is arranged below the receptacle 11 in the usual manner and is provided with a suitable door 14 at one side and an outlet 15 on the other, which outlet is adapted to connect with the chimney or smokestack. The flanges 12 extend from the rear portion of the firebox, as shown at 16 in Fig. 2, are bent laterally, as shown at 17 and 18, and then extend diagonally forward to a point Serial No. 397,492 (No model.)

adjacent to the outlet 15. It will thus be seen that the fire and hot products from the firebox will pass with the draft around between the flanges 12" and through the outlet 15. The flanges are filled with the sap, and it will be seen that a very large heating-surface will be exposed to the fire, and as aresult the sap will be rapidly evaporated. The receptacle 11 and the flanges 12 are preferably lined on the outside with wood or some similar material to prevent them from being chilled by the air, and the receptacle is supported on an ash-box 19, which is provided with side flanges 19 to prevent the displacement of the receptacle and extends rearward beyond the rear end of the evaporator and supports a saptank 20, in which the sap to be evaporated is stored. This tank connects by means of a pipe 21 with the receptable 11, and the sap may bedrawn through the pipe, or any other suitable means may be provided for conveying the sap from the tank to the receptacle 11. hen the sirup is to be boiled down to sugar, it is placed in a pan 22, which pan is provided with flanges 23 and it is supported in the receptacle 11, the flanges resting upon the upper edge of the said receptacle, and the sirup may be then boiled to sugar in the pan while the sirup is being evaporated in the receptacle 11. The arrangement of the tank in connection with the evaporator keeps the sap therein warm, so that it evaporates quickly when it is transferred to the receptacle 11.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. An evaporator comprising an evaporating receptacle or pan having a fire-box beneath it closed at its ends, an inlet and outlet in the same end of the box, and hollow flanges depending from and communicating :ith the receptacle and dividing the fire-box into longitudinal return-flues, substantially as set forth.

2. An evaporator comprising a receptacle having a depending hollow flange around its lower edge, which thus forms a fire-box, a suitable door and outlet for the fire-box, and a series of curved hollow flanges arranged centrally on the under side of the receptacle and forming flues between them, substantially as described.

3. The combination, with the ash-box, of a receptacle having a depending hollow flange around the edge, which rests upon the box, and having a suitable door and outlet, and a series of curved hollow flanges extending centrally from the receptacle to the ash-box, said flanges terminating at a point adjacent to-the outlet, substantially as described.

4. An evaporator comprising the fiat ashbox, the receptacle having depending hollow flanges resting on the ash-box, a series of curved hollow flanges extending centrally from the receptacle to the box and terminating adjacent to the outlet to form fines, a tank on the rear end of the ash-box, a siphon-pipe connecting said tank with said receptacle, and the supplemental pan within and having flanges resting on the edges of the evaporating-receptacle, substantially as shown and described.

HARRISON F. THURSTON. Witnesses:

EARNEST E. TAYLOR, ALFRED C. BLIss. 

